goFranz // personal journal

Senior Identity Engineer · AI for regulated systems · ½ machine

I build identity and trust systems, and now the AI inside them

Fourteen years across digital identity, compliant crypto, medical and IoT. These days a lot of that is putting AI into products where a wrong answer has consequences. Sometimes the engineer, sometimes the founder.

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Franz Geffke at the controls of a light aircraft — Off the clock.

RoleSenior Identity Engineer @ TWIN (IOTA Foundation)

StackTypeScript · Rust · Move · Solidity

FocusRegulated AI · OID4VP · SD-JWT VC · EU AI Act

Latest writing

111 entries · since 2014

Work with me

I take on a few outside engagements a year: identity and systems work, or AI where a wrong answer has consequences. Recently that's meant an OID4VP verifier interop-tested against the official EUDI Reference Wallet, and a GLEIF vLEI to IOTA DID bridge with keys that never leave the browser. Selected work has the rest.

Identity & systemsDigital identity, verifiable credentials, KYC, and the backend around them. TypeScript and Rust, architecture to production.start a conversation → AI building, proofing and trainingAI that fits your stack, EU-resident or self-hosted. Security reviews of what you already shipped, and training for the people who have to run it./work-with-me →

What I build

SaaS · hosted

GPTMusePrivacy-first AI platform with access to ChatGPT, Claude, Gemini, Grok and others. Pay-per-use pricing.gpt-muse.com →

FormshiveEmbed and process forms from your website; Pay as you go or self-host from €590/year.formshive.com →

CheckoutbayE-Commerce platform for SMEs and individuals; Pay as you go or self-host from €790/year.checkoutbay.com →

Self-hosted · open source

StackpitSelf-hosted, Sentry-compatible error tracking. Single binary, single SQLite file, no external dependencies. MIT./software/stackpit →

ForsetiSelf-service UI & OAuth2 login / consent bridge for Ory Kratos + Hydra. Server-rendered in Rust. AGPL-3.0./software/forseti →

Desktop apps & libraries

guix-rsDesktop GUI for GNU Guix — search, install, upgrade and reconfigure, no terminal. Built in Rust on Iced; ships the libguix crate. GPL-3.0./software/guix-rs → iced_webviewEmbed web views in iced apps — pick a rendering engine (litehtml, Blitz, Servo or CEF), drop a widget in your view. A Rust library. Apache-2.0./software/iced-webview → See allEvery app, library, CLI and tool I've shipped — including the smaller Rust crates that don't get a page of their own./software · 19 projects →

Around the world

Where I've worked

Born in East Germany; at home between Europe, the Middle East and Southeast Asia. The pins are projects and places.

Selected work

Remote Patient Monitoring System

Bangkok, Thailand Web · Nostr

Nostrop: Nostr Client

Lisbon, Portugal Mobile

Mobile Authenticator

Bangkok, Thailand Blockchain

NFT Marketplace

Bangkok, Thailand

Tell me what you're building and where it's stuck. I'll tell you whether I'm the right person for it.

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